Specific Gravity, Carcass Fat, Abdominal Fat, and Yield Data in Broiler Chickens

Becker, Walter A.; Spencer, John V.; Mirosh, Larry W.; Verstrate, John A.

doi:10.3382/ps.0602045

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…The correlations of .72 and .74 for percentage carcass fat with abdominal and sartorial fat weights, respectively, were similar, highly significant, and consistent with those reported in chickens by Spencer et al (1978), Summers and Leeson (1979), Becker et al (1981), and Burgener et al (1981). Conversely, Deaton et al (1973), Cunningham and Morrison (1976), and Griffiths et al (1977) noted that the weight of the abdominal fat depot did not necessarily reflect the percentage of carcass fat in chickens.…”

Section: Resultssupporting

confidence: 89%

Phenotypic Relationships Between Adiposity, Breast Weight, and Body Weight in Female Japanese Quail

1982

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Data were obtained from 8-week-old females for body weight, breast weight, percentage carcass fat, weight of the sartorial and abdominal fat depots, and the number and size of adipocytes in the abdominal fat depot in parental lines and various crosses of Japanese quail. Correlations of breast weight with body weight, abdominal and sartorial fat depot weight, and percentage carcass fat were positive, significant, and of a similar magnitude. The relationship of body weight with percentage carcass fat was positive and significant, while those between body weight and sartorial and abdominal depot weight and size and number of adipocytes were low. Percentage carcass fat was highly correlated in a positive manner with the weight of the sartorial and abdominal fat depots. Also, there were highly significant positive correlations between depot weights and the number and size of abdominal adipocytes. (

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Section: Resultssupporting

confidence: 89%

Phenotypic Relationships Between Adiposity, Breast Weight, and Body Weight in Female Japanese Quail

1982

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“…This is true for house sparrow ( Passer domesticus ) (SG = 1.05), domestic chicken ( Gallus gallus ) (SG = 1.044), and quail ( Coturnix japonica ) (SG >1.053) (Tserveni & Yannakopoulos, 1988; table 3 in Hamershock et al, 1993). SGs in the region of 1.05 have been also found in broiler and Bronze turkey eviscerated carcasses (Becker, Spencer, Mirosh, & Verstrate, 1981; Essary, Dawson, Wisman, & Holmes, 1965; Moran Jr, Summers, & Orr, 1968; Moreng, Whittet, & Enos, 1963). Wilson et al (1992) observed that the SG without air in ducks (Anatidae and Alcidae), divers (Gaviidae), penguins (Spheniscidae), and cormorants (Phalacrocoracidae) are generally very close to 1.0 or higher.…”

Section: Methodological Considerationsmentioning

confidence: 94%

A review and reappraisal of the specific gravities of present and past multicellular organisms, with an emphasis on tetrapods

Larramendi¹,

Paul

Hsu³

2020

The Anatomical Record

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The density, or specific gravity (SG), of organisms has numerous important implications for their form, function, ecology, and other facets of beings living and dead, and it is especially necessary to apply SG values that are as accurate as practical when estimating their masses which is itself a critical aspect of living things. Yet a comprehensive review and analysis of this notable subject of anatomy has never been conducted and published. This is such an effort, being as extensive as possible with the data on hand, bolstered by some additional observations, and new work focusing on extinct animals who densities are least unknown: pterosaurs and dinosaurs with extensive pneumatic complexes, including the most sophisticated effort to date for a sauropod. Often difficult to determine even via direct observation, techniques for obtaining the best possible SG data are explained and utilized, including observations of floating animals. Neutral specific gravity (NSG) is proposed as the most important value for tetrapods with respiratory tracts of fluctuating volume. SGs of organisms range from 0.08 to 2.6, plant tissues from 0.08 to 1.39, and vertebrates from about 0.75 (some giant pterosaurs) to 1.2 (those with heavy armor and/or skeletons). Tetrapod NSGs tend to be somewhat higher than widely thought, especially those theropod and sauropod dinosaurs and pterosaurs with air‐sacs because respiratory system volume is usually measured at maximum inhalation in birds. Also discussed is evidence that the ratio of the mass of skeletons relative to total body mass has not been properly assayed in the past.

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“…A rather low correlation between specific gravity and carcass grade of r = .165 was determined by Moran et al (1968). In more recent works, Becker et al (1981) reported specific gravity to fat correlations of from -.31 to -.36 and -.58 to -.69 for male and female broilers, respectively, while Fortin and Chambers (1981) reported a linear correlation (R 2 ) of .36 for predicting total fat from specific gravity.…”

Section: Introductionmentioning

confidence: 95%

“…Becker et al (1979Becker et al ( , 1981 reported correlations ranging from .51 to .76 between abdominal fat pad (as a percent of live weight) and total carcass fat. Becker et al (1979) reported a model correlation (R 2 ) of .82 between fat pad weight and weight of fat in the carcass.…”

Section: Introductionmentioning

confidence: 96%

Evaluation of a Specific Gravity Method for Estimating the Total Carcass Fat of New York-Dressed Broiler Chickens

1986

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Four trials were conducted to determine the applicability of a specific gravity method to estimate total New York-dressed carcass fat. Specific gravity values were compared to abdominal fat pad measurements, and total carcass moisture and fat values. Carcasses were produced over a very wide range of total carcass fat, from 6.5 up to 18.8%, by feeding one of five test diets with calorie-to-protein ratios ranging from 61 to 260. Total carcass fat was estimated on each New York-dressed carcass using specific gravity and abdominal fat pad weight. Each carcass was then ground, homogenized, and analyzed for total moisture and total fat. Results indicated that total carcass moisture had the best correlation with total analyzed carcass fat (r = -.95). Abdominal fat pad percent and weight resulted in the next best correlations (r = +.92 and r = +76, respectively), while specific gravity resulted in the poorest correlation (r = -.73). The low correlation value for specific gravity is thought to be due primarily to entrapped air in the lungs and air sacs of the New York-dressed carcasses. (

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Specific Gravity, Carcass Fat, Abdominal Fat, and Yield Data in Broiler Chickens

Cited by 12 publications

References 10 publications

Phenotypic Relationships Between Adiposity, Breast Weight, and Body Weight in Female Japanese Quail

Phenotypic Relationships Between Adiposity, Breast Weight, and Body Weight in Female Japanese Quail

A review and reappraisal of the specific gravities of present and past multicellular organisms, with an emphasis on tetrapods

Evaluation of a Specific Gravity Method for Estimating the Total Carcass Fat of New York-Dressed Broiler Chickens

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